* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  height: 100vh;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #34495e;
}
.card {
  width: 400px;
  height: 300px;
  background-color: #e74c3c;
  cursor: pointer;
}
.card:hover .overlay {
  opacity: 1;
}
.overlay {
  width: 100%;
  height: 100%;
  opacity: 0;
  background-color: rgba(0, 0, 0, 0.5);
  display: flex;
  justify-content: center;
  align-items: center;
  transition: all 0.3s ease-in-out;
}
.bt {
  width: 40px;
  height: 40px;
  border-radius: 20px;
  background-color: transparent;
  border: 2px solid #fff;
  position: relative;
  cursor: pointer;
  transition: all 0.3s ease-in-out;
}
.bt::before {
  content: "+";
  position: absolute;
  color: #fff;
  font-weight: 900;
  font-size: 1.5rem;
  border-radius: 5px;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -51%);
  opacity: 1;
  transition: opacity 0.25s ease-in-out;
}
.bt::after {
  content: attr(data-readMore);
  white-space: nowrap;
  color: #fff;
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -51%);
  opacity: 0;
  transition: opacity 0.25s ease-in-out;
}
.bt:hover {
  width: 120px;
  border: #e74c3c;
  border-radius: 20px;
  background-color: #e74c3c;
}
.bt:hover::before {
  opacity: 0;
}
.bt:hover::after {
  opacity: 1;
}
